Temperature effects on iodine adsorption on organo-clay minerals

Riebe, Beate; Dultz, Stefan; Bunnenberg, Claus

doi:10.1016/j.clay.2004.01.004

Cited by 74 publications

(26 citation statements)

References 7 publications

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“…The im-MMNP s may be used as an inexpensive, effective, and alternative sorbent for removal of iodine from water solutions. A comparison between the proposed sorbents with those reported for the adsorption of iodine [9][10][11][12][13][14][15] shows that it provides higher adsorption capacity and simpler separation of iodine loaded sorbent from water solutions.…”

Section: Resultsmentioning

confidence: 99%

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Application of Modified Silica Coated Magnetite Nanoparticles for Removal of Iodine from Water Samples

et al. 2012

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Abstract:The adsorption of iodine onto silica coated magnetite nanoparticles (im-SCMNPs) that modified with imidazole was investigated for removal of high concentrations of iodine from wastewater. Modified silica magnetite nanoparticles showed high efficiency in removing iodine from wastewater samples. The optimum pH for iodine removal was 7.0-8.0. The adsorption capacity was evaluated using both the Langmuir and Freundlich adsorption isotherm models. The size of the produced magnetite nanoparticles was determined by X-ray diffraction analysis and scanning electron microscopy. Synthesized magnetite nanoparticles showed the high adsorption capacity and would be a good method to increase adsorption efficiency for the removal of iodine in a wastewater treatment process. The Langmuir adsorption capacity (qmax) was found to be 140.84 mg/g of the adsorbent.

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Section: Resultsmentioning

confidence: 99%

“…The weak adsorption capabilities of clays for iodine can be enhanced by exchanging the cations in the natural inorganic interlayer with certain organic cations [3]. Activated aerogels impregnated with silver ion can enhance the iodine adsorption due to an increase in electrostatic attraction [4].…”

Section: Introductionmentioning

confidence: 99%

Application of Modified Silica Coated Magnetite Nanoparticles for Removal of Iodine from Water Samples

et al. 2012

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“…The proposed materials showed really high adsorption property, however these materials could not be suitable for the disposal waste for long-term. Thus, the long-term assurance materials have been investigated 5,6 ; cupric or calcium or phosphate compounds, imogolite 7 , clay and lignite coal.…”

Section: Introductionmentioning

confidence: 99%

Zeolite / Apatite Composites: A Long-Term Assurance Material for the Disposal of Radioactive Waste

Watanabe

Ikoma

Suetugu

et al. 2006

Phosphorus Research Bulletin

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“…Dultz and Bors 6 and Riebe et al 7,8 modified bentonite clay minerals by replacing natural inorganic cations with tetra-alkylammonium ions. The resulting organoclays exhibited a high sorption capacity for I -, compared to untreated samples, especially when samples were treated with hexadecylpyridinium (HDPy) cations.…”

mentioning

confidence: 99%

“…Organoclays, which are produced from natural clays through a modification with cationic surfactants, provide an affinity for non-polar organic species and inorganic anions. 5 Dultz and Bors 6 and Riebe et al 7,8 modified bentonite clay minerals by replacing natural inorganic cations with tetra-alkylammonium ions. The resulting organoclays exhibited a high sorption capacity for I -, compared to untreated samples, especially when samples were treated with hexadecylpyridinium (HDPy) cations.…”

mentioning

confidence: 99%

Effective and Selective Sorption of Iodide by Thin Film of Multilayered MnO2 Intercalated with Cationic Surfactants

Nakayama

Sato

2013

ANAL. SCI.

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Following the magnitude-9.0 Tohoku earthquake on 11 March 2011 and the subsequent failure of the Fukushima No. 1 nuclear power plant, radioactive iodine was released into the environment.1 Radioactive isotopes of iodine 131 and 129 are produced during the fission of uranium atoms, and can be liberated during the normal operation of nuclear reactors and fuel reprocessing facilities, 2 as well as in the cases of nuclear accidents. Although 129 I is much less radioactive than 131I with a half-life of 8.02 days, its long half-life (1.57 × 10 7 years) allows it to diffuse over a long period of time in the hydrosphere, including groundwater and seawater, as anions (most often as iodide, I -). To date, several procedures have been developed for the recovery of iodide anions from aqueous solutions. I -can form precipitates with metal cations, such as Bi 3+ and Pb 2+ , at the high concentration. Lefèvre et al. found an affinity of cuprous oxide (Cu2O) toward I -, where the sorption capacity was unaffected by the presence of a 1000 fold excess of Cl -ions. 3 However, the potential region at which Cu2O existed stably was as small as about 0.2 V. Polyethylenimine-epichlorohydrin resins showed the maximum sorption capacity values, as high as 600 mg/g; however, the addition of background electrolytes (NaCl and Na2SO4) remarkably reduced their performance. 4 Layered or porous minerals, such as clays and zeolites, possess a negatively charged surface and exhibit cation-exchange properties as a result. Organoclays, which are produced from natural clays through a modification with cationic surfactants, provide an affinity for non-polar organic species and inorganic anions. 5Dultz and Bors 6 and Riebe et al. 7,8 modified bentonite clay minerals by replacing natural inorganic cations with tetra-alkylammonium ions. The resulting organoclays exhibited a high sorption capacity for I -, compared to untreated samples, especially when samples were treated with hexadecylpyridinium (HDPy) cations. When a large volume of contaminated water is treated, we must keep it in mind that the sorbents possess a sufficient selectivity toward the object with respect to major cations and anions existing in wastewater. In the present study, a thin film of organo-modified multilayered MnO2, whose interlayer is occupied with HDPy surfactants, was fabricated on an electrode substrate through a simple electrochemical approach. The electrode-supported film was investigated with regard to the sorption capability for iodide anions in both the absence and presence of NaCl and Na2SO4. To the best of our knowledge, this is the first iodide sorbent with a thin-film form. The preparation process, an anodic electrodeposition, can readily supply thin and uniform films with a large surface area, even on a substrate of complex shape.Non-radioactive NaI (99.5%) and hexadecylpyridinium chloride (HDPyCl, >99.0%) were purchased from Wako Pure Chemicals, and used without further purification. The electrodeposition of MnO2 was made in a standard three-electrode cell using a ...

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Temperature effects on iodine adsorption on organo-clay minerals

Cited by 74 publications

References 7 publications

Application of Modified Silica Coated Magnetite Nanoparticles for Removal of Iodine from Water Samples

Application of Modified Silica Coated Magnetite Nanoparticles for Removal of Iodine from Water Samples

Zeolite / Apatite Composites: A Long-Term Assurance Material for the Disposal of Radioactive Waste

Effective and Selective Sorption of Iodide by Thin Film of Multilayered MnO2 Intercalated with Cationic Surfactants

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